An electric bicycle comprises a removable battery pack (1) for storing electrical energy, and a frame element (5) to which the battery pack (1) is intended to be fixed. The battery pack comprises a housing and a lock arranged in said housing and the frame element (5) comprises a projecting locking element (21), said locking element (21) penetrating into the housing of the battery pack (1) through an entry opening so as to co-operate with said lock with a view to fixing said battery pack (1) to said frame element (5).